Messier 10 (Ophiuchus)

Object image
Fig.1 - High population of blue stragglers (stars that appear younger than their neighbors): Messier 10 in Ophiuchus, photographed with a 16-inch f/4.5 Dob on an equatorial platform.
Object name: Constellation: Coordinates: Apparent size: Visual brightness:
Messier 10 (NGC 6254) Ophiuchus 16h57m / -04°06' 20' 6.6 mag

The globular cluster Messier 10 (NGC 6254) in the constellation Ophiuchus. Messier 10 is the second brightest globular cluster in Ophiuchus and is estimated to be 14,300 light-years away from Earth. Its spatial diameter is approximately 83 light-years. Messier 10 was discovered by French astronomer Charles Messier in 1764 (source: Wikipedia).

Twenty-three 3-minute exposures (75 minutes total exposure) at ISO 800 taken on May 21 / 22, 2020 were added for this shot with the DeepSkyStacker software and the final image processing was done in Photoshop.

Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison: image of the moon with the same equipment).

Search chart
Fig.2 - Search chart for Messier 10. Map © 2021 "The Mag-7 Star Atlas Project", www.siaris.net. Map is slightly modified. The map can be downloaded here.